Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-82876

CVE-2026-82876CRITICAL

Phison PS3111-S11 Controller Firmware Signature Verification Bypass

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   L   L   N   H   N   H   H   H    9.3   .0012    1.7     —

AFFECTED
  Product                         Versions    Fixed
  PS3111-S11 Controller Firmware  SBFQT1.3 –  —

TIMELINE
  Aug 31  Reserved by VulnCheck
  Aug 31  Published (CNA: VulnCheck)
  Sep 2   EXPLOIT PUBLISHED — CVE-2026-82876 (Phison Electronics Corporation PS3111-S11 Controller Firmware). Public exploit reference added.

CWE-347 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Awaiting Analysis

Description

Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 31, 2026	Reserved	Reserved by VulnCheck
August 31, 2026	Published	Published (CNA: VulnCheck)
September 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-82876 (Phison Electronics Corporation PS3111-S11 Controller Firmware). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Phison Electronics Corporation	PS3111-S11 Controller Firmware	—	SBFQT1.3	—

Weaknesses

CWE-347

References (3)

Authoritative record: CVE-2026-82876 at cve.org

Vendors: phison electronics

Weaknesses: CWE-347

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-82876 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.